Looking for IGBT amplifier schematics?

[NareshBrd]

Try finding new devices, and go ahead.
I was telling you that the quest is not fruitful.
If you have a different opinion, go right ahead, and tell us all about the journey and the result.

 

[huggygood]

We are in a DIY forum for power amplifier, IGBT are for power use : Why we can't use it for power amplifier ? It is for knowledge 🙂
I suppose you have different range of power IGBT ?
MOSFET are also very difficult to make linear power amp with, not very linear this device, it is a switch ! and hard to drive with the Cgs capacity.
IGBT seems a little easier to use.

I did the opposite, I emptied an inverter welding station to add an audio amplifier to it for my garage and it works very well too 😁

 

[jerome69]

Only solutions in this world !
The problem to find new complementary IGBT devices for audio is tricky. Toshiba GT20 series are very expensive (20€) !
But Toshiba still makes new N device for domestic appliance. I think it is the right market for the manufacturer. Audio is home appliance ?
https://toshiba.semicon-storage.com...uct/igbts-iegts/igbts/detail.GT20N135SRA.html
3€ for the price.
I'd go with these N devices...

 

[huggygood]

😉

 

[jerome69]

Find other schematics.
See main brands for low power IGBT are Toshiba, Infineon, Onsemi and ST... Thanks to home appliance market !
A simple and low cost classe B solid state amplifier project is possible 😉
Start to working, where I have finished my other projects in progress.

 

[egellings]

The IGBT can be pressed into service as an analog amplifier output stage. Question is, why bother, beyond just trying to make a point? MOSFETs and BJTs have that territory well covered.

 

[egellings]

You can get some pretty hefty IGBT's.
Good for high power amps.

Same with bipolars.

 

[wayne]

I think the Toshiba IGBT parts went away due to the difficulty in using them.
I think only a couple of manufacturers got product to market. Forte and Threshold under Mike B and maybe Counterpoint.
The oscillation proclivities of Mosfets and the thermal runaway of bipolars.
The market spoke and they went away for linear use.

 

[Wik]

All the IGBT I tested: extremely high resolution, extremely fine, but very hazy, foggy, tired.

tired??? you mean no good for long time kistening?????????

 

[cumbb]

Were already slow and tired to sleep;-)

 

[jean-paul]

Almost no UPS without IGBTs. That is their domain.

 

[Ultima Thule]

From a thread discussing Elektor's IGBT amplifier here's my take on IGBT quoted below, it's an old post so the question is have IGBT's improved a lot since then, I will leave that for you to research.
https://www.diyaudio.com/community/threads/compact-power-amplifier-from-elektor.22408/post-318903

IGBT amps...

I don't have experiences especially with IGBT for an audio amplifier but as far as I know about IGBT's there's also a problem with the current tail when "switching off" the IGBT, eg. their switching off capability is far from ideal which is the reason that they haven't been used even for SMPS at 100 kHz.
Those I have worked with are proportionately huge 6 or 7 pack for inverters and were switched with a frequency of 5 kHz.
Moreover these IGBT's in switching application do also need a dead-time generator in some applications just because of the current tail phenomenon otherwise the start to "burn".

I checked up those Toshiba IGBT's mentioned in this thread and I can't say I'm thrilled over when reading the datasheet, IGBT's are known for their current tail and not specifying it is IMO like hiding a disadvantage!
I found a datasheet over GT20G101 which I dont know how close it is to GT20D101 besides from difference of the letters D and G, but this IGBT have a typical fall time of 4 uS and turn off of 4,5 uS and it don't "sound" good to me.
Eg. I suspect the current tail phenomenon with IGBT's can give some crossover distortion at higher audio frequencies and more else warm up IGBT's, but this should be checked wheter it could be so I don't want to make any 100% claim here at present before the issue is investigated further.

I think it would be much better to mimic an IGBT by using discrete BJT's and FET's and thereby controlling the built-in FET's drain connected to the base inside the IGBT etc if IGBT's is a must...

Anyhow here's an article of another IGBT amp with also a simple latch-up protection circuit: https://web.archive.org/web/20070223121523/http://www.audiodesignguide.com:80/tra/igbtsch.jpg

 

[jerome69]

Yes it is interesting to see if low power IGBT are improved. New devices are build 🙂

 

[WhiteDragon]

It peaked curiosity , but they are common for 600 volt and up fast switching.

all there is now days is n channel.
Agree rather just build normal bipolar amplifier.

But the thought is what counted.
I checked a few feasible devices. but all 3 had models that didnt even work.
and be stuck doing a Quasi. which dont do well with mosfet type behavior

So yep, reminds me of lateral stuff , not really fun.
but it did sound cool for a min